Materials Welding

Front 1

Define Hardness

Back 1

The ability to resist wear, abrasion, cutting and indentation

Front 2

Define Toughness

Back 2

Ability to withstand impact or shock

Front 3

Define Ductility

Back 3

Ability to be drawn out in tension without breaking

Front 4

Define Malleability

Back 4

Ability to be extended by hammering without breaking

Front 5

Define Brittleness

Back 5

a property which permits no permanent deformation beofre breaking

Front 6

Define Stiffness

Back 6

Ability to resist deformation (bending)

Front 7

Define Elasticity

Back 7

Ability to resume original shape and dimensions after and external load or force acting upon it is removed

Front 8

What metals contain Iron

Back 8

Ferrous

Front 9

What is the name for all metals other then iron or steel

Back 9

Non-Ferrous

Front 10

Name 2 common types of hardness testing machines

Back 10

1.Brinell Hardness Tester
2.Rockwell Hardness Tester

Front 11

How is Pig Iron produced

Back 11

In a Cupola Furnace with the resulting molten Iron containing 2-4% carbon

Front 12

The percentage of carbon in Cast Iron is:

Back 12

2-4%

Front 13

If most of the carbon combines chemically with the iron the material is called what

Back 13

White Cast Iron

Front 14

The material is known as grey cast iron if:

Back 14

The carbon is mechanicall mixed with the iron in the form of Graphite

Front 15

True or False:
Grey Cast Iron can be produced by cooling the materials rapidly in the mould

Back 15

False

Front 16

Name one of the principal uses of White Cast Iron

Back 16

Machining Parts such as Crusher Jaws and grinding mill balls and liners

Front 17

Wrought Iron was once used extensivly for boilers because of what important properties

Back 17

1.Ductility
2.Resistance to Corrosion

Front 18

Brass is primarily a mixture of what two elements

Back 18

Copper & Zinc

Front 19

What types of metals are typically used for boiler shells and tubes

Back 19

Carbon and Alloy Steels

Front 20

Aluminum is produced by electrolysis from:

Back 20

Bauxite Ore

Front 21

What are the pysical properties of aluminum

Back 21

1.Very Malleable and Ductile
2.A good Conductor of electricity
3.An excellent conductor of heat
4.Highly resistant to Corrosion
5.Low Tensile Strength

Front 22

List 4 products typically manufactured from Aluminum

Back 22

1.Internal Combustion Engine Parts
2.Aircraft Parts
3.Tubing
4.Water Jackets

Front 23

Welding Electrodes use a system of 4 digits prefixed by the letter E what does the E indicate

Back 23

That the rod is suitable for electic welding

Front 24

Ture or False:
With arc welding the electrode is consumed

Back 24

True

Front 25

What is the most satisfactory source of direct power for arc welding

Back 25

a portable motor generator set

Front 26

True or False:
The reason direct current is prefered in arc welding is that the current flows in only one direction

Back 26

True

Front 27

In Stright polarity welding the elctrode is connected to what terminal

Back 27

The negative Terminal

Front 28

Gas Metal Arc Welding (GMAW) or MIG welding is a welding process in which

Back 28

A continuous and consumable wire electrode is used

Front 29

Which type of electrode is used to produce the weld in a Gas Tungsten Arc Welding (GTAW or TIG) process

Back 29

Nonconsumable Electode

Front 30

True or False:
With Braze welding the base metal is heated to tinning temperature and a bronze filler rod is applied

Back 30

True

Front 31

Braze welding is used to repair what 2 types of metals

Back 31

Cast and Malleable Iron

Front 32

What must be know before a suitable welding inspection method can be chosen

Back 32

The service conditions

Front 33

List 4 nondestructive welding inspection tests

Back 33

1.Visual
2.Liquid Dye Penetrant
3.Radiographic
4.Ultrasonic

Front 34

What method of detection is effective and widely used in the welded joints of tanks and containers

Back 34

Flouresent Liquid Dye Penetrant

Front 35

True or False:
When conducting ultrasonic inspection, boilers, pressure vessels and piping systems must not be in service

Back 35

False

Front 36

Define Bare Electrode

Back 36

A filler metal electrode with no coating

Front 37

Define Base Metal

Back 37

The metal to be welded or cut

Front 38

Define Blowhole

Back 38

A gas pocket or weld cavity caused by gas or moisture trapped in the weld

Front 39

Define Coalescence

Back 39

Unite two pieces into one

Front 40

Define Coated Electrode

Back 40

A covered electrode consisting of a rod with a light or heavy covering to protect the molten metal from the atmosphere and to stabilize the arc

Front 41

Define Crater

Back 41

A depression or hole at the end of an arv welding bead

Front 42

Define Filler Metal

Back 42

Metal to be added in making a weld

Front 43

Define Fusion

Back 43

The melting together of filler rod and base metal

Front 44

Define Porosity

Back 44

The presence of gas pockets or voids in the metals or welds

Front 45

Define Reducing Flame

Back 45

A flame rich in acetylene

Front 46

Define Residual Stress

Back 46

The stress remaining in a structure as a result of welding

Front 47

Define Reverse Polarity

Back 47

The negative lead is clamped to the work

Front 48

Define Root Crack

Back 48

A crack originating in a weld root

Front 49

Define Slug Inclusion

Back 49

Solid non-metalic material entrapped in the weld metal or between the weld and the base metal

Front 50

Define Spatter

Back 50

Metal particles sprayed out during welding which do not form part of the weld